Incandescent electric lamp



. J. CAMERON INCANDESCENT ELECTRIC LAMP.

APPLICATION man Nov.

Patented 0st. 3l, 1922.

tenaz WILL J. CAMERON, 0F CEICAGQ, ILLINOIS.

INCANDESCENT ELECTRIC LAMP.

application inea November 5, 1920. serial no. 422,088.

To all whom t may concern:

lBe it known that I, WILL J. CAMERON, a citizen of the Dominion ofCanada, residing at Chicago, in the county of Cook and State ofIllinois, have invented a new and useful Improvement in an IncandescentElectric Lamp, of which the following is a specification.

My present invention has relation to lamps of the type disclosed in' myprior United States Letters Patent No. 1,208,743 issued to me onDecember 19th, 1916, for an incandescent electric lamp, which lamps areused by dentists, surgeons and persons engaged in similar lines of workfor the purpose of making examinations, operations and diagnosis.

The type of lamp I have designed is elongated and is small in diameterhaving a cylindrical body of approximately four inches long byone-fourth of an inch thick, and the bulb that is enclosed therein is ofan extremely miniature size.

Besides carrying out all of the objects of my aforesaid Letters Patent,one of the objects of the present invention is to reduce the cost ofmanufacture by eliminating the central tubular conductor insulator orseparator of my prior device, and to separate or space the conductors ina cheaper and more readily assembled manner. Another object is toprovide a cushion for the miniature light bulb so that it is notsusceptible to any more than a very small degree of vibration which isnot of sufficient extent to permit the bulb to contact the enclosingcasin In assembling the parts, I emp oy a dry plaster of Paris fillerthat is tamped into the tubular casing and is then moistened to alterthe physical characteristics thereof so that it will harden or set andform a solid mass. This is preferably carried out by a method similar tothat set forth in my United States Letters Patent No. 1,348,978 issuedto me on August 10th, 1920, for a method of filling lamps. In order toprevent the moisture reaching the bulb I have provided means in mypresent lamp that will cause a stoppage in the rise of the liquid whichis moved upwardly in the plaster of Paris by capillarity so that themoisture will not reach the bulb and cannot cause any damage thereto.

Further objects will be apparent to others after an understanding of myinvention is had, and I prefer to accomplish the divers objects insubstantially the manner hereinafter particularly reference being theaccompanying drawings portion of this specification, in

fully described, and as more pointed out in the claims, now had to whichform a which- Figure 1 isa central longitudinal section of my lamp, theelectrical contact plug belng omitted to show the manner of securing theconductors during the charging or leading of the casing, the wholestructure being drawn to a greatly exaggerated scale for clearness.

Figure 2 is a fragmental view partly in section of the contact plug endafter assembly.

Similar reference characters designate the same parts in the severalviews and by referring thereto, it will be seen the lamp consists of anouter casing comprising a screw plug end having a centrally borednon-conducting core 2 of porcelain, or the like, with a. cent-ralterminal or Contact element 3 and surrounded by a threaded metal casing4. The upper or inner portion 5 of the metal casing 4 is cylindrical andUnthreaded and receives the end of the lamp body or casing which ispreferably cemented therein by means of any suitable moisture andchemical-resisting cement.

The lamp body or casing consists of a cylindrical tube 6 preferably ofwhite or milk glass of the desired diameter and length, the outer end ofwhich is `closed by a lenticular light condensing cap or plug 7 that isfused or cemented thereon in any desirable manner.

The light bulb 8 is of preferably cylindrical form so as to secure thegreatest length of filament 9 without adding tothe diameter thereof.rI`he conduct-ors 'l0 and 11 pass out through the inwardly formedfilament supporting base 12 and arc retained in a separated or spreadrelation to each other by leading them upon opposite sides of. adownwardly and inwardly turned teat 13 which has been formed in theoperation of sealing the bulb.

Irior to inserting bulb 8 and conductors 10 and 11 into the tubularcasing 6 the conductors are spread apart close to the bulb by placingthem upon opposite sides of a pad or plug 14 of wool felt or likefibrous material so that the teat 13 of' the bulb is embedded andcushioned in the adjacent end of the plug, as seen in Figure 1 of thedrawings. The bulb, plug and spaced conductors are then introduced intothe casing by forcing the cushion plug 14, which is normally of greaterdiameter than the interior of the casing, into the latter until the bulbhas been ositioned adjacent the lenticular closure 7 1n which positionthese elements will be rctained in their relative positions by thefrictional engagement of the cushion plug with the interior surfacecasing. The conductors are now drawn taut and their outer end portionsare temporarily held in position by bending them back, as indicated at10a and 11 in Figure 1 of the drawings. The cementitious materialpreferably in a powdered form such as plaster of Paris, is now placed inthe casing until the latter is filled from plug 14 to the rear end ofthe casing or body and the same subjected to the action oi Water orother liquid or moisture 1n substantially the manner described 1n myaforesaid Letters Patent, No. 1,348,978 for the method of filling lamps.This consists in i11- verting the lamps and subjecting the lower openends thereof to moisture or fluid so that the latter rises in the casingby capillarity until the entire charge of cementitious material has beenmoistened, after which the structures are removed and permitted to setand dry which hardens the material and forms an insulator and separator15 for the conductors 10 and 11 so that they are .permanently retainedin their spaced positions. The insulator also strengthens the bodyportion of thelamp, and it will be seen that plug 14, besides performingthe functions above mentioned in cushioning the bulb and separating theconductors, also provides a dam or blockade against the moisture or thecementitious material passing the same and reaching the bulb itself.

Adjacent the screw plug end, casing 6 1s provided with acircumferentially outwardly extending corrugation 16 the outer portionof which forms a shoulder or stop for the metal casing 4 of the plug,and the interior of this corrugation receives the cementitious fmaterial which .forms a key 17 to hold the cement in place when it hasset and hardcned.

What I claim new is:

1. An incandescent electric lamp comprising a casing having an annularcorrugation adjacent one end, alight bulb disposed in said casing,conductors leading from said bulb, means for separating said conductorsand retaining them in close proximity to said casing comprising a cementlling said casing and keyed in position by said corrugation, and devicesfor connecting said conductors with a suitable electric current.

2. An incandescent electric lamp comprising an insulating casing, alight bulb disposed therein, conductors leading from said bulb, meansconnecting the opposite ends of said conductors with a suitable electriccircuit and a cushioning ldevice against which the adjacent portion ofsaid bulbV abuts.

3. An incandescent electric lam comprising an insulating casing, a lig tbulb disposed therein,conductors leading .from said bulb, meansconnecting the opposite vends of said conductors with a suitableelectric circuit, and a cushioning device against which the adjacentportion of said bulb abuts and upon opposite sides of which saidconductors are respectively disposed.

4. lAn incandescent electric lamp com'- prising a casng,'a light bulbdisposed therein, conductors leading from said bulb through the casing,means connecting the outer ends of said conductors with a suitableelectric circuit, and an insulating material introduced into said casingin which said conductors are embedded whereby said conductors areretained in separated relation and insulated from each other.

5. An incandescent electric lamp comprising a casing, a light bulbdisposed therein, n conductors leading from said bulb through saidcasing, a cushioning element against which the adjacent portion of saidbulb abuts and which separates said conductors adjacent the bulb, and aninsulating material introduced into said casing between said cushioningelement and the opposite end of said casing in which said conductors areembedded and retained in separated relation and insulated from eachother.

6. An incandescent electric lamp comprising a casing, a light bulbdisposed therein adjacent one end, a cushion against which one end ofsaid bulb abuts, conductors leading from said bulb upon opposite sidesof said cushion and drawn taut vto the opposite end of said casingwhereby thc conductor end of said bulb is firmly embedded in saidcushion, and vdevices connecting said conductors with a 4suitableelectric circuit.

7. A n incandescent electric lamp comprising a casing, a light bulbdisposed therein adjacent one end, a cushion against which one end ofsaid bulb abuts, conductors leading from said bulb upon opposite sidesof said cushion and drawn taut to the opposite end of casing whereby theconductor end of said bulb is firmly embedded in said cushion, aninsulating element introduced in said tube between the cushion and theopposite end of the casing in which said conductors are retained inseparated and insulated relation` to each other, and devices connectingsaid c onductors with a suitable electric circuit.

8. An incandescent electric lamp comprising an insulating casing, alight bulb disposed therein, conductors leading from said bulb, meansconnecting the opposite Vends of said conductors with a suitableelectric circuit, `and a pad of felt interposed between said conductorsand against which the adjacent portion of said bulb abuts.

9. An incandescent electric lamp comprising an exterior casing, anilluminating unit at one end thereof, conductors leading from said unitto the opposite end of said casing and separated from each other so asto lie adjacent said casing, devices connecting said conductors With asuitable electric circuit, and an insulating element disposed Withinsaid casing whereby said illuminating unit is retained in position inthe end of the casing and said conductors are kept in spaced relation toeach other between said insulating element and said casing.

l0. An incandescent electric lamp comprising an exterior casing, a lightbulb enclosed in one end of said casing, conductors leading from saidbulb to the opposite end of said casing and spaced from each other so asto lie adjacent said casing, devices connecting said conductors With asuitable electric circuit, and an insulating element extending from saidbulb to the opposite end of said casing whereby said bulb is retained inposition and said conductors are kept in spaced relation to each otherupon the exterior of said insulating element.

Signed at Chicago, county of Cook, and State of Illinois, this 28th dayof October,

WILL J. CAMERON.

